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''Stipa spartea'' - renamed ''Hesperostipa spartea'', and commonly called Porcupine grass, is a bunchgrass species in the genus ''Stipa''.〔(USDA - ''Hesperostipa spartea'' ) . accessed 6.26.2012〕 ''Stipa spartea'' or ''Hesperostipa spartea'' is native to the Great Plains and Canadian Prairies of North America.〔 It is also found in grasslands of the Rocky Mountains in Western Canada and the Western United States.〔 ==Description== ''Hesperostipa spartea'' has a bunchgrass foliage mass of in diameter 〔(NPIN: ''Hesperostipa spartea'' ) . accessed 6.26.2012.〕 The flower stalks are upright and arching, yellow, in late Spring.〔 The seeds are needle-like with sharp tips and long tails.〔 The tails are composed of two different strands that dry at different rates and twist around each other, causing the sharp head of the seed to be driven into the soil. Just behind the sharp, needle-like tip, is a collar of long thick hairs that face backward, preventing the seeds from working their way back out of the soil. This species of grass can have its seeds entangled in sheep's hair while they are feeding, and once entangled it often works its way into the animal's skin. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Stipa spartea」の詳細全文を読む スポンサード リンク
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